If you mean the front brake lever, underneath on the bottom of the pivot pin is an "E" clip:
http://lackof.org/taggart/hacking/supermicro-fan/e-clip.jpg
I remove them by inserting a small flat tip screw driver in one of the two "gaps" formed by the clip, and twist.
After the clip is removed, the pivot pin should be able to be pushed out from the bottom.
Depending on location/angle, you might have to remove/loosen and pivot the rear view mirror out of the way to allow the pivot pin to fully extract from it's hole.
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